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Summary: Naval instructional film concerning the rôle of escort vessels.
Description: In the face of the powerful threat posed by the U-boat the crew of an escort vessel must be a perfect team, "...any one man who fails to pull his weight can bring disaster to the convoy". The film illustrates an imaginary U-boat attack, which is quickly detected by HF.DF and tracked by radar and asdic. If the operators are alert the U-boat should not be able to escape. Counter-attack - "As the shudder of explosions comes nearer and nearer the U-boat crew, foiled by good escort work, await the inevitable end." The air offensive makes it more difficult for the enemy to build, maintain and provide crews for their submarines. The RAF harasses the U-boats when they return to their bases, but they should not be allowed to return. "Failure is seldom due to faulty instruments, it is nearly always due to the men behind them not being on his toes." Escort duty is probably the Navy's most vital work - without supplies the battle fleets would merely be prisoners in their own harbours. The convoys must get through.